Malicious PDF — malware analysis report

Static analysis result for SHA-256 91dcd54e96a6a273…

MALICIOUS

PDF

92.2 KB Created: 2021-07-03 22:28:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: b80d7628071f05e7288e9908ff985d67 SHA-1: b62b1c0724b0a098f2db5073a613fd6041f7a0e5 SHA-256: 91dcd54e96a6a2736007949c5d04cddd86e510793ba8f6ea68fc851fff5cc3fb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress sites and other domains, suggesting a link farm designed to redirect users to malicious content. The PDF structure and embedded links are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1606e4dd7296d2---vugikeni.pdf In PDF document text
    • http://hudsonohiohighschoolclassof1980.net/clients/7/7d/7d4b1ad73701457990394555a34ab01f/File/vokekijimo.pdfIn PDF document text
    • http://eiak.org/upload/editor/files/38440392847.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092f451bb299---jibozi.pdfIn PDF document text
    • https://diedacorporation.net/freesiafiles/file/24623598094.pdfIn PDF document text
    • http://frickcontrols.com/uploads/files/77050824694.pdfIn PDF document text
    • http://bajcsidavidfoto.com/_user/file/mawagafepukizapodisoluju.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160812b67bff91---muvivunijodi.pdfIn PDF document text
    • https://www.surajinformatics.com/wp-content/plugins/super-forms/uploads/php/files/e048788abbf90ed41d99fba8ed1e6955/85044279558.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d87e9b527ca---jaxewatidibonumagu.pdfIn PDF document text
    • http://www.conectadoscomdeus.tv/arquivos/file/72384926597.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/8717c551884a1719894b78269b63dd3d/zilijotevasobefibo.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/6d7e7d351b8ed012d540e9c0491152d1/53059848541.pdfIn PDF document text
    • https://binarbaidtrading.com/public_html/userfiles/file/47096958877.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/99646455787.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073d6ab48c07---tariwilafepuxetitonim.pdfIn PDF document text
    • http://cybernet.asia/UserFiles/File/resosonep.pdfIn PDF document text
    • https://didacostruzioni.it/userfiles/file/70298983911.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c4887293a89---67093089884.pdfIn PDF document text
    • http://babamoleskine.com/files/file/31163026878.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/piwiketidaga.pdfIn PDF document text
    • http://banglatalkies.com/dynamic-images/cms/file/22642721050.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2f408d9dd---megabudarusare.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=stages+of+a+presentationPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010787.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10787 16940 bytes
SHA-256: 4cb775c96d473f3ae183002468e48617768fda5ca6d1524e2addb309747678fa
font_01_sfnt_off0001336d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1336D 10564 bytes
SHA-256: 38a1cb1776487d88d3cf7961e824f7af4ddbd61a323f7f4fbd25c82f70b209b5
font_02_sfnt_off00014b9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B9F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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